25LC320AH-I

Microchip 25-series SPI EEPROM, 32Kbit/4KB, AH high-reliability revision, 10MHz, 2.5-5.5V, 32B page, WP+HOLD, 1M cycles, industrial -40~85°C, enhanced reliability

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Manufacturer Part：

25LC320AH-I

Package：

8-pin SOIC/TSSOP/DFN surface-mount packages, AH = enhanced reliability / high-temperature revision, industrial grade

Description

Product Overview

The 25LC320AH-I is a 32 Kbit (4 K x 8) SPI serial EEPROM from Microchip Technology with the ‘AH’ revision, operating at 2.5 V to 5.5 V with industrial temperature range (-40 °C to +85 °C). This variant of the popular 25LC320A features enhanced characteristics including improved electrical specifications and higher reliability, making it suitable for demanding industrial and automotive-grade applications.

Organized as 4,096 bytes (4 KB) with 32-byte page write, the 25LC320AH delivers the same compact non-volatile storage capacity as the 25LC320A but with enhanced quality and reliability characteristics. The device supports SPI modes 0,0 and 1,1 at up to 10 MHz clock frequency, providing efficient data transfer for configuration data, calibration parameters, and device identification storage.

Features include hardware Write-Protect (WP) pin, software-configurable block protection (BP0, BP1), /HOLD pin for pausing SPI communication, sequential read capability, and self-timed write operation with auto-erase. The device offers over 1 million erase/write cycles and greater than 200-year data retention. The ‘H’ suffix typically indicates enhanced robustness, extended reliability, or automotive qualification status for high-reliability applications.

Key Specifications

Parameter	Value
Memory Type	SPI Serial EEPROM (high reliability)
Density	32 Kbit (4 Kbyte)
Organization	4,096 x 8 bits
Interface	SPI (Modes 0,0 and 1,1)
Max Clock Frequency	10 MHz
Operating Voltage	2.5 V to 5.5 V
Page Size	32 bytes
Page Write Time	5 ms max (typical 3 ms)
Read Current	2 mA max @ 5.5 V
Standby Current	5 µA max
Write Protect	HW WP + SW block protection (BP0/1)
HOLD Function	Yes
Endurance	1,000,000+ erase/write cycles
Data Retention	> 200 years
ESD Protection	> 4,000 V
Operating Temperature	-40 °C to +85 °C (industrial)
Packages	8-pin SOIC, TSSOP, DFN

Features

32 Kbit (4 K x 8) SPI serial EEPROM, AH high-reliability revision
10 MHz max SPI clock
SPI modes 0,0 and 1,1 supported
2.5 V to 5.5 V wide voltage range
32-byte page write buffer
Self-timed write cycle with auto-erase
Block protection (BP0, BP1)
Hardware Write-Protect pin
/HOLD pin for bus sharing
Sequential read capability
Power-on reset and brown-out detection
Enhanced reliability characteristics (AH revision)
> 1M erase/write cycles
> 200-year data retention
Industrial temperature range
RoHS compliant, Pb-free
Suitable for automotive and high-reliability apps

Applications

Automotive electronics and sensors
Industrial high-reliability systems
Medical device parameter storage
Power supply and battery management
Aerospace subsystem configuration
Telecom equipment
Sensor calibration data
Device identification and tracking

Product Introduction:25LC320AH-I Product Introduction

The 25LC320AH-I is a 32 Kbit (4,096 x 8-bit) SPI serial EEPROM from Microchip Technology featuring the ‘AH’ high-reliability revision. The -I suffix denotes industrial temperature range (-40°C to +85°C), LC indicates 2.5 V minimum operating voltage, and the ‘AH’ designation represents an enhanced revision with improved electrical characteristics, tighter process controls, and higher reliability suitable for demanding applications including automotive and medical systems.

With 4 KB of non-volatile storage in a compact 8-pin package, the 25LC320AH is designed for applications requiring reliable parameter storage such as sensor calibration data, device configuration, serial numbers, and manufacturing traceability information. The 32-byte page write buffer provides efficient block programming for multi-byte data structures.

The SPI interface supports both Mode 0 (0,0) and Mode 3 (1,1) at clock frequencies up to 10 MHz. Comprehensive write protection includes a hardware Write-Protect (WP) pin and software-configurable block protection bits (BP0, BP1), offering protection from none to the entire array. The /HOLD pin allows pausing SPI communication for multi-device bus sharing scenarios.

The AH revision builds on the proven 25LC320A architecture with enhanced quality screening and process controls for higher reliability in critical applications. Standard 25-series features are maintained: power-on reset, brown-out detection, over 1 million erase/write cycles, and greater than 200-year data retention. The device is available in surface-mount packages (SOIC, TSSOP, DFN) suitable for automated assembly.

Working Principle:25LC320AH-I Working Principle

Same core architecture as 25LC320A with enhanced reliability screening:
1. 4,096 bytes EEPROM array, 32-byte page size
2. 4-wire SPI interface: /CS, SCK, SI, SO. 10 MHz max, Modes 0 and 3
3. Standard instruction set: READ, WRITE, WREN, WRDI, RDSR, WRSR
4. Status register: WIP, WEL, BP0, BP1, WPEN bits
5. Block protection: none, 1/4, 1/2, or entire array
6. Enhanced process control and screening for AH grade
7. Low power: 2 mA active, 5 µA standby

Pin Description:25LC320AH-I Pin Definition and Functions

Standard 8-pin 25-series EEPROM pinout: Pin 1=/CS, 2=SO, 3=/WP, 4=Vss, 5=SI, 6=SCK, 7=/HOLD, 8=Vcc. Available in SOIC-8, TSSOP-8, and DFN-8 surface-mount packages. Industrial grade: -40°C to +85°C.

Application Scenarios:In which products and applications is25LC320AH-I used

Automotive Electronics and Sensors: Automotive sensor modules, body electronics, and infotainment systems requiring reliable parameter storage. The AH revision’s enhanced reliability meets the stringent quality requirements of automotive applications, and industrial temperature range covers typical automotive operating environments.
Industrial High-Reliability Systems: Mission-critical industrial control systems, safety controllers, and process automation where data integrity and long-term reliability are paramount. Enhanced screening ensures consistent performance over the full temperature range and product lifetime.
Medical Device Parameter Storage: Medical equipment and diagnostic devices storing calibration data, device configuration, and usage logs where high reliability is essential for patient safety and regulatory compliance. Long data retention (>200 years) ensures calibration data remains valid for the product lifetime.
Power Supply and Battery Management: High-reliability power supplies, BMS systems, and battery chargers storing configuration parameters, fault logs, and battery cycle data. Block write protection prevents accidental corruption of critical parameters.

Alternative Models:What chips are recommended as replacements for 25LC320AH-I

Manufacturer	Part Number	Density	Revision	Notes
Microchip	25LC320A-I/SN	32 Kbit	A	Standard A revision
Microchip	25AA320A-I/SN	32 Kbit	A	1.8V operation
Microchip	25LC640A-I/SN	64 Kbit	A	Double density
STMicro	M95320-DRMN3TP	32 Kbit	–	ST alternative